Refs #33348 -- Made SimpleTestCase.assertFormError()/assertFormsetErrors() raise an error for unbound forms/formsets.

django/contrib/admin/helpers.py

@@ -83,6 +83,10 @@ class AdminForm:
     def non_field_errors(self):
         return self.form.non_field_errors
 
+    @property
+    def is_bound(self):
+        return self.form.is_bound
+
     @property
     def media(self):
         media = self.form.media
@@ -437,6 +441,10 @@ class InlineAdminFormSet:
     def non_form_errors(self):
         return self.formset.non_form_errors
 
+    @property
+    def is_bound(self):
+        return self.formset.is_bound
+
     @property
     def media(self):
         media = self.opts.media + self.formset.media

django/test/testcases.py

@@ -595,6 +595,12 @@ class SimpleTestCase(unittest.TestCase):
         for i, context in enumerate(contexts):
             if form not in context:
                 continue
+            if not context[form].is_bound:
+                form_repr = repr(context[form])
+                self.fail(
+                    f"{msg_prefix}The form {form_repr} is not bound, it will never "
+                    f"have any errors."
+                )
             found_form = True
             for err in errors:
                 if field:
@@ -680,6 +686,12 @@ class SimpleTestCase(unittest.TestCase):
         for i, context in enumerate(contexts):
             if formset not in context or not hasattr(context[formset], "forms"):
                 continue
+            if not context[formset].is_bound:
+                formset_repr = repr(context[formset])
+                self.fail(
+                    f"{msg_prefix}The formset {formset_repr} is not bound, it will "
+                    f"never have any errors."
+                )
             found_formset = True
             for err in errors:
                 if field is not None:

tests/test_utils/tests.py

@@ -1454,7 +1454,12 @@ class AssertFormErrorTests(SimpleTestCase):
         self.assertFormError(response, "form", "field", "invalid value")
 
     def test_empty_errors_unbound_form(self):
+        msg = (
+            "The form <TestForm bound=False, valid=Unknown, fields=(field)> is not "
+            "bound, it will never have any errors."
+        )
         response = mock.Mock(context=[{"form": TestForm()}])
+        with self.assertRaisesMessage(AssertionError, msg):
             self.assertFormError(response, "form", "field", [])
 
     def test_empty_errors_valid_form(self):
@@ -1590,7 +1595,12 @@ class AssertFormsetErrorTests(SimpleTestCase):
         self.assertFormsetError(response, "formset", 0, "field", "invalid value")
 
     def test_empty_errors_unbound_formset(self):
+        msg = (
+            "The formset <TestFormset: bound=False valid=Unknown total_forms=1> is not "
+            "bound, it will never have any errors."
+        )
         response = mock.Mock(context=[{"formset": TestFormset()}])
+        with self.assertRaisesMessage(AssertionError, msg):
             self.assertFormsetError(response, "formset", 0, "field", [])
 
     def test_empty_errors_valid_formset(self):